A mixture of two substances, $$\(R\)$$ and $$\(S\)$$, is heated gently. The damp red litmus paper turns blue. What are $$\(R\)$$ and $$\(S\)$$ ?
A.
B.
C.
D.
Exam No：0620_s25_qp_11 Year：2025 Question No：18
Answer:
A
Knowledge points:
6.3.3.1. the rate of the forward reaction is equal to the rate of the reverse reaction
Solution:
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